Door oob



:(No Model.)

J-. H; SHAW:

' DOOR KNOB. No. 321,862.

Patented July 7, 1885.-

U ITED STATES PATENT QFFlCEO JOHN H. SHAWV, OF NEW HAVEN, CONNECTICUT,ASSIGNOR TO SARGENT 8t 00., or SAME PLACE.

DOOR-KNOB.

EBPECIPIQATION forming part of Letters Patent No. 321,862, dated July 7,1885.

Application filed April 27, I885.

1'0 all whom it may concern.-

Be it known that'l, JOHN H. SHAW, of New Haven, in the county of NewHaven and State of Connecticut, have invented new Improvements inDoor-Knobs; and I do hereby declare the following, when taken inconnection with accompanying drawings, and the letters of ref erencemarked thereon, to be afull, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1, a section through two knobs, the one at the right showing themale screw on the knob and female screw in the neck, the one at the leftshowing this order reversed; Fig. 2, an inside view of the part E of theknob; Fig. 3, an inside view of the part G of the knob.

This invention relates to an improvementin that class of door-knobswhich are made from cast metal, and which are cast in two parts, dividedat thelargest diameter in a plane at right angles to the axis, in orderthat the knob may be cast hollow. Various devices have been employed tosecure the two partstoget-her. In that more generally employed the onepart is cast with a flange upon its edge to overlap the edge of theother part, and so as to be turned down over the said other part andembrace it to such an extent as to hold the two parts together. In somecases the two parts are soldered or brazed at their meeting edges.

The object of my invention is a cheap and simple construction, andwhereby the subsequent labor of uniting the two parts at their meetingedge may be avoided; and it consists in a neck having an extensiontherefrom to enter the rear side of the knob, and so that a shoulder isformed around the neck, combined with the rear part of the knob, adaptedto rest against said shoulder, and the forward part of the knobconstructed to meet the rear part in a plane at right angles to theaxis, each of the two parts constructed to interlock the one with theother, the outer part of the'knob constructed with a concentric screwextending from its inner surface to the neck, the neck. correspondinglyscrew-threaded, and whereby when the two parts are set together andinterlocked the rear part may be set on over the neck, and the (Nomodel.)

screw on the outer part, turnedinto the corre sponding threaded recessin the neck, will clamp the two parts upon the neck, as more fullyhereinafter described.

A represents the neck, which is constructed to fit the spindle B in theusual manner, and may be adjusted thereon by the usual setscrew,C, orotherwise. The neck is constructed with a concentric extension, D, atits forward end, smaller in diameter than the neck, and so as to form ashoulder, a. The extension is internally screw-threaded concentric withthe neck.

E is the rear part of the knob, which is made from cast metal and ofconcavo-convex shape, having a central hole. F, adapted to pass on overthe extension D of the neck and set against the shoulder a, as seen inFig. 1; G, the other or outer part ofthe knob, of shape corresponding tothe inner part, E, the division between the two being at the largestdiameter and in a plane at right angles to the axis of the knob.Preferably, one partsay G-is constructed with a flange, 1), around itsouter edge to overlap the other part, E, as seen in Fig. 1.

Upon the inside of the part Cr and in axial line, ascrew, H, is attachedto or made an integral part thereof, the screw H screwthreadedcorrespondingto the screw-thread in the neck, and of a length to extendinto the neck.

One of the parts of the knobsay Eis constructed with a notch, d, uponits inner edge, and the other part, G, with a corresponding lug, 0,adapted to set into the notch d on the other part, as seen in Fig. 1.hen the two parts are set together, with the notch on the one engagingthe lug on the other, the rotation of one part independent of the otheris prevented.

To attach the knob to the neck, the two parts are engaged by the notchand lug, as before described, then set on over the neck, the screw Hentering the neck, and the knob turned to draw the screw into the neckand the knob onto the neck until the inner part, E, comes to a hardbearing against the shoulder a on the neck. The knob should be turnedonto the neck with very considerable force, so as to make the clamp-likeengagement between the knob and the neck so strong that the ordinary useof the knob, as in working the latch, will have no effect to unscrew theknob from the neck.

The engagement between the two parts I have represented as by a singlelug on the one and corresponding notch on the other. It isimmaterialupon which the lug or notch be formed, and there maybe severalinterlocking devices applied, if desired, it only being essential to myinvention that there shall be an interlocking-connection between the twoparts, so that one part may not be rotated independent of the other.

By this construction of knob the two parts are cast complete, and intheir union no labor is required to make engagement between the edgr sof the two parts. The overlapping flange simply hides the joint andforms an annular ornamental bead around the knob.

I have represented the neck as constructed with a female screw, and thepart G with a male screw; but this order may be reversed the femalescrew made on the part G and the male screw on the neck, as indicated atthe left in Fig. 1.

I do not wish to be understood as claiming, broadly, a knob constructedin two parts divided at right angles to the axis at the largest diameterof the knob, and so that one part may be interlocked with the other asthe two parts are secured together, as such construction, I am aware, isnot new.

I claim- The herein-described door-knob, consisting of the neck A,adapted to receive the spindle, and constructed with an extension, I),at its outer end, forming a shoulder, a, around the neck, the part E ofthe knob, of concavo-convex shape, having a central opening to set onover the extension of the neck and so as to come to a bearing upon theshoulder a, and the part G of the knob, of similar concaveconvex shapeand corresponding to the part E, the said parts constructed the one witha projection and the other with a corresponding notch, so that the twoparts may interlock each other, the part G and the neck constructed theone with a male and the other with a female screw concentric with theaxis of the neck, and whereby said two parts interlocked are clamped tothe neck, substantially as described.

JOHN H. SHA\V.

\Vi tn esses JonN L. BRAND, \Vn. S. COOKE.

